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Taxus cuspidata is part of the precious trees left over from the Tertiary Period. The present study aimed to provide a scientific basis for understanding the mechanism of the endangered Taxus cuspidata population and its protection as well as to provide a theoretical basis for its population restoration and reconstruction. To investigate the current situation and development trends of natural succession of Taxus cuspidata , the present study was conducted within 25 hectares of fixed monitoring sample plots in the National Natural Reserve of Taxus cuspidata . The population of Taxus cuspidata was surveyed per tree, and the static life table was compiled using the method of “space instead of time.” The population structure, quantitative characteristics, and spatial distribution pattern of Taxus cuspidata were analyzed to determine the current situation and trends in development. The results revealed the following: the diameter class structure was the inverted “J” type, and the number of seedlings, saplings, and adult trees was similar. The population quantity also showed a stable trend. However, for the age class, the population of Taxus cuspidata was found to be unstable in the early stage. The survival curve of Taxus cuspidata showed that age classes I and II are Deevey-III curves, and age class III and latter are closer to a Deevey-II curve. This shows that the growth of the Taxus cuspidata population when they are young is very unstable, whereas their growth during middle age and at maturation is relatively stable and subsequently gradually declines. The results also show that Taxus cuspidata population has a very high early mortality rate; therefore, their numbers are significantly less after age class III. The age classes of Taxus cuspidata showed an aggregation distribution pattern on different scales. |
